Histological Evaluation of Nano-Micro Titanium Implant Surface Treatment in Beagle Humerus

Yun, Kwidug,Kang, Seongsoo,Oh, Gyejeong,Lim, Hyunpil,Lee, Kwangmin,Yang, Hongso,Vang, Mongsook,Park, Sangwon American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.2

<P>The objective of this study was to investigate the effects of nano-micro titanium implant surface using histology in beagle dogs. A total of 48 screw-shaped implants (Megagen, Daegu, Korea) which dimensions were 4 mm in diameter and 8.5 mm in length, were used. The implants were classified into 4 groups (n = 12): machined surface (M group), RBM (Resorbable Blasting Media) surface (R group), nano surface which is nanotube formation on the machined surface (MA group) and nano-micro surface which is nanotube formation on the RBM surface (RA group). Anodic oxidation was performed at a constant voltage of 20 V for 10 min using a DC power supply (Fine Power F-3005; SG EMD, Anyang, Korea). The bone blocks were investigated using histology. There was no inflammation around implants, and new bone formation was shown along with the nanomicro titanium implant surfaces. The amount of bone formation was increased depending on time comparing 4 weeks and 12 weeks. At 12 weeks, lamellar bone was more formed along with the nano-micro titanium implant surfaces than 4 weeks. It indicated that nano-micro surface showed good result in terms of osseointegration.</P>

Perceptions and attitudes of dental hygienists toward radiation safety and protection in the Republic of Korea

Kwidug Yun,Kyung-Min Lee,Seo-Young An,Suk-Ja Yoon,Ho-Gul Jeong,Jae-Seo Lee 대한구강생물학회 2021 International Journal of Oral Biology Vol.46 No.4

To investigate the perceptions and attitudes of dental hygienists toward radiation safety management in Korea. A total of 800 dental hygienists were randomly selected for an anonymous survey, and 203 of them participated. The questionnaire items included the following: sex, career period, type of installed radiographic equipment, recognition of the diagnostic reference level (DRL), participation in radiation safety education, and attitudes toward radiation protection for both patients and dental hygienists. The participants were divided into two groups according to their years of experience (< 10 years versus ≥ 10 years). The difference between the groups was investigated according to frequency distribution. Fisher’s exact test or Pearson’s chi-square (χ2) test was used as appropriate. A regression analysis was performed to investigate the impact of wearing a thyroid collar for personnel protection during patient radiation exposure. The types of installed radiographic equipment included panoramic radiography (96.1%), cephalometric radiography (76.9%), intraoral radiography (72.9%), and cone-beam computed tomography (69.5%). Significant differences were observed in the learning pathway for the DRL (Fisher’s exact test, p < 0.05), satisfaction with radiation safety education (Pearson’s χ2 test = 5.3975, Pr = 0.02), and use of personnel radiation monitoring systems (Pearson’s χ2 test = 18.1233, Pr = 0.000) between the groups. Significant differences were also observed in personnel protection using a thyroid collar and patient protection during panoramic radiography (odds ratio = 14.2). Dental hygienists with more than 10 years of experience were more satisfied with radiation safety education and more interested in radiation monitoring. Considering career experience, customized, continuous, and effective radiation safety management education should be provided.

A study on metal coating method for prevention of screw loosening of dental implants

Jaesam Ban,Minki Kim,Kwidug Yun 한국표면공학회 2013 한국표면공학회 학술발표회 초록집 Vol.2013 No.11

Investigation on nanotubular surface structure of Ti-10Nb-10Ta alloy by anodization.

Kim, Hyunseung,Park, Sangwon,Lim, Hyunpil,Yun, Kwidug,Lee, Kwangmin American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.6

<P>The anodized nanotubular surface structure of a Ti-10wt.%Ta-10wt.%Nb alloy were characterized by field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and depth profiling, and transmission electron microscopy (TEM). A highly ordered layer of individual nanotubes approximately 100 nm in diameter and 600 nm in length was formed. XPS revealed the nanotubes to be composed mainly of TiO2. The XPS depth profile suggested that the nanotubular surface structure consisted of three zones: (1) a zone containing fluorine element, (2) a zone containing oxygen and titanium elements whose concentrations changed rapidly, and (3) a zone containing mainly titanium element.</P>

The accuracy of a 3D printing surgical guide determined by CBCT and model analysis

Boyoung Ma,Taeseok Park,Inkon Chun,Kwidug Yun 대한치과보철학회 2018 The Journal of Advanced Prosthodontics Vol.10 No.4

PURPOSE. The aim of this clinical study was to assess the accuracy of the implants placed using a universal digital surgical guide. MATERIALS AND METHODS. Among 17 patients, 28 posterior implants were included in this study. The digital image of the soft tissue acquired from cast scan and hard tissue from CBCT have been superimposed and planned the location, length, diameter of the implant fixture. Then digital surgical guides were created using 3D printer. Each of angle deviations, coronal, apical, depth deviations of planned and actually placed implants were calculated using CBCT scans and casts. To compare implant positioning errors by CBCT scans and plaster casts, data were analyzed with independent samples t-test. RESULTS. The results of the implant positioning errors calculated by CBCT and casts were as follows. The means for CBCT analyses were: angle deviation: 4.74 ± 2.06°, coronal deviation: 1.37 ± 0.80 mm, and apical deviation: 1.77 ± 0.86 mm. The means for cast analyses were: angle deviation: 2.43 ± 1.13°, coronal deviation: 0.82 ± 0.44 mm, apical deviation: 1.19 ± 0.46 mm, and depth deviation: 0.03 ± 0.65 mm. There were statistically significant differences between the deviations of CBCT scans and cast. CONCLUSION. The model analysis showed lower deviation value comparing the CBCT analysis. The angle and length deviation value of the universal digital guide stent were accepted clinically.

은이온을 첨가한 장석계 도재의 분광 측색학적 평가

김지현(Jihyun Kim),송경우(Kyeongwoo Song),노세라(Sera Noh),윤계림(Kyelim Yun),윤귀덕(Kwidug Yun) 대한턱관절교합학회 2015 구강회복응용과학지 Vol.31 No.1

Designing Eggshell Membrane Proteins-based Nanotopographical Patches for Enhanced Bone Regeneration

( Daun Kim ),( Sunho Park ),( Sujin Kim ),( Yonghyun Gwon ),( Woochan Kim ),( Kwidug Yun ),( Jangho Kim ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.2

Guided bone regeneration (GBR) membrane is considered as a platform that can heal bone defects (i.e., bone regeneration) while preventing gingiva infiltration into the bone regeneration area. Despite of the variety of current GBR membrane materials such as collagen, fast absorption and low tensile strength as well as high cost are still critical problems in bone regeneration. To overcome these limitations, synthetic polymers (e.g., polycaprolactone (PCL), one of FDA-approved materials) are used, which could be an alternative to current collage-based GBR membranes. However, the poor properties of PCL (e.g. low bioactivity and hydrophobic properties) are limited to use as a GBR membrane for bone regeneration. To address this issue, we proposed a rational design of PCL-based GBR membrane using eggshell membrane proteins (ESMP) and nanotechnology. We developed aligned nanotopography-based PCL patches using capillary force lithography. And then, the PCL nano-patches were coated with ESMP. We showed that the ESMP coated PCL nanotopography-based patches could enhance various characteristics (e.g., mechanical and adhesive properties) and bioactivity (e.g., bone regeneration in animal models) compared to other control groups such as PCL flat-patch, PCL nano-patch, and ESMP coated PCL flat-patch.

Error analysis of 3D printing surgical guide according to tooth position

( Junyoun Lee ),( Minho Yoon ),( Taeseok Park ),( Inkon Chun ),( Kwidug Yun ) 조선대학교 구강생물학연구소 2017 Oral Biology Research (Oral Biol Res) Vol.41 No.4

The purpose of this study is to evaluate the accuracy of digital surgical guide according to implant position. Dentiform with D2 bone density, which has a #15, 16, 17, 24, 25, 26, 34, 35, 36, 45, 46, 47 edentulous space, is fabricated. Model scanning and cone beam computed tomography (CBCT) data was taken and overlapped using In2Guide software, and the implants were planned. The digital surgical guide was fabricated using 3D printing and the implants were installed using the surgical stent. CBCT were retaken after the implants were installed, and the “before” surgery and “after” surgery CBCTs were overlapped. Then, the degree differences and length differences at implant shoulder and tip area were statistically analysed. The mesial implant of the tooth-supported type showed 1.06±0.53°, 0.29±0.19 mm, 0.39±0.24 mm, the middle implant showed 1.36±0.67°, 0.40±0.15 mm, 0.42±0.23 mm and the distal implant showed 1.39±0.69°, 0.59±0.29 mm, 0.67±0.41 mm respectively. The mesial implant of the tissue-supported type showed 1.76±0.83°, 0.57±0.29 mm, 0.88±0.31 mm, the middle implant showed 2.15±0.65°, 0.69±0.25 mm, 1.08±0.28 mm. and the distal implant showed 2.83±1.17°, 1.09±0.50 mm, 1.34±0.45 mm. The greater the proximity of the implant to the mesial side, the smaller the error.

전자 서베잉을 이용한 서베이드 크라운 제작 후 국소의치 수복

민병귀(Byungkwee Min),전대전(Daejeon Jun),양홍서(Hongso Yang),박상원(Sangwon Park),임현필(Hyunpil Lim),윤귀덕(Kwidug Yun),박찬(Chan Park) 대한턱관절교합학회 2017 구강회복응용과학지 Vol.33 No.2

디지털 수술용 가이드의 지지타입에 따른 정확도 평가

이준연,윤민호,박태석,전인곤,윤귀덕,Lee, Junyoun,Yoon, Minho,Park, Taeseok,Chun, Inkon,Yun, Kwidug 대한치과보철학회 2018 대한치과보철학회지 Vol.56 No.1

Purpose: The purpose of this study is to evaluate the accuracy of surgical stent according to the supported type. Materials and methods: 5 sets of dental models which have tooth supported edentulous area and tooth-tissue supported edentulous area were made. Dental model were scanned with model scanner, and CBCT was taken. CT data and model scan data were overlapped using In2Guide software, implant were virtually planned in the software. Surgical stents are fabricated by 3D printing. The implant fixture were installed using the surgical stent, CBCT were retaken. CBCT before surgery and after surgery were overlapped, and the differences (angle difference, coronal difference, apical difference) were evaluated using statistical analysis. Results: In the assessment of the accuracy of surgical guides according to arch type, there are no statistically significant differences between maxilla and mandible. In the case of support type, tooth supported stents showed lower angle difference and length difference than tooth-tissue supported stents, which are statistically significant. Conclusion: Arch type does not affect the accuracy of surgical stents. But tooth support stents are more accurate than tooth-tissue support stents in the case of angle and length difference. 목적: 본 연구의 목적은 디지털 소프트웨어를 이용하여 제작된 수술용 스텐트를 이용하여 지지 형태에 따른 수술용 스텐트의 정확성을 분석하는 것이다. 재료 및 방법: 총 5세트의 치아모형에 대하여 양측에 지대치가 있는 치아지지형 무치악 모델과 근심에만 지대치가 있는 치아-조직 지지형 무치악 모델을 제작하였다. 모델을 스캐닝을 시행하고, 전산화 단층 촬영을 실시하여 In2Guide 소프트웨어를 이용하여 전산화 단층 촬영술의 정보와 모델 스캐닝 정보를 중첩하여 임플란트 고정체(USII, $4{\times}10mm$, Osstem, Seoul, Korea)에 대한 가상적인 위치배열을 실시하고 수술용 스텐트 제작하였다. DMAX 수술 키트을 사용하여 임플란트 고정체를 식립하였다. 식립후 전산화 단층 촬영을 실시하여 찍어 술전에 계획된 임플란트와 실제 식립된 임플란트 사이에 오차(angle difference, coronal difference, apical difference)를 측정하여 통계분석을 시행하였다. 결과: 악궁에 따른 정확도 결과에서 하악이 전반적으로 각도, 길이오차의 값이 작게 나타났으나 이는 통계적 유의성이 없었다. 스텐트의 지지 형태에 따른 정확도 결과에서 치아지지형 스텐트가 치아-조직지지형 스텐트보다 길이오차와 각도오차의 값이 통계적으로 유의하게 작은 값을 보였다. 결론: 악궁(상악, 하악)은 수술용 스텐트의 정확도에 영향을 미치지 않았으며, 치아 지지형 스텐트는 치아-조직지지형 스텐트보다 더 적은 오차를 보여 주었다.